Transition-metal-free oxidative cyclization of N-propargyl ynamides: stereospecific construction of linear polycyclic N-heterocycles

2018 ◽  
Vol 20 (14) ◽  
pp. 3271-3278 ◽  
Author(s):  
Cai-Ming Wang ◽  
Lin-Jun Qi ◽  
Qing Sun ◽  
Bo Zhou ◽  
Zhi-Xin Zhang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxidative Cyclization ◽  
Diverse Range ◽  
Metal Free ◽  
Cascade Cyclization

An efficient NaBArF4-catalyzed oxidative cascade cyclization of N-propargyl ynamides has been developed, leading to a diverse range of polycyclic N-heterocycles with high diastereoselectivity and enantioselectivity.

Transition Metal-Free Cascade Cyclization of Epoxy-Ynamides: To Go for 1,3-Oxazines or 1,4-Oxazines?

2016 ◽  
Vol 18 (21) ◽  
pp. 5752-5755 ◽  
Author(s):  
A. Leela Siva Kumari ◽  
Alla Siva Reddy ◽  
K. C. Kumara Swamy
Keyword(s):  
Transition Metal ◽  
Metal Free ◽  
Cascade Cyclization

NIS-catalyzed oxidative cyclization of alcohols with amidines: a simple and efficient transition-metal free method for the synthesis of 1,3,5-triazines

2015 ◽  
Vol 13 (45) ◽  
pp. 10973-10976 ◽  
Author(s):  
Abhishek R. Tiwari ◽  
Akash T. ◽  
Bhalchandra M. Bhanage
Keyword(s):  
Transition Metal ◽  
Efficient Method ◽  
Oxidative Cyclization ◽  
Metal Free ◽  
Reaction Works

A simple and efficient method for the synthesis of 1,3,5-triazines by NIS-catalyzed oxidative cyclization of alcohols with amidines has been developed. The reaction works smoothly under transition-metal and phosphine-free conditions.

Transition-metal-free oxidative cyclization reaction of enynals to access pyrane-2-one derivatives

2021 ◽  
Author(s):  
Farzaneh Ansari ◽  
Hormoz Khosravi ◽  
Alireza Abbasi Kejani ◽  
Mahsa Armaghan ◽  
Walter Frank ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Metal Free

K2S2O8 is introduced as an oxygen source and C–H functionalization agent in a novel selective metal-free oxidative cyclization of enynals to synthesize α-pyrone derivatives with a relatively broad substrate scope via the formation of two C–O bonds.

Visible light-induced tandem oxidative cyclization of 2-alkynylanilines with disulfides (diselenides) to 3-sulfenyl- and 3-selenylindoles under transition metal-free and photocatalyst-free conditions

2017 ◽  
Vol 4 (7) ◽  
pp. 1322-1330 ◽  
Author(s):  
Qing Shi ◽  
Pinhua Li ◽  
Yan Zhang ◽  
Lei Wang
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Oxidative Cyclization ◽  
Efficient Synthesis ◽  
Metal Free

A simple and efficient synthesis of 3-sulfenyl (3-selenyl) indoles via visible light-induced cyclization of 2-alkynylanilines with disulfides(diselenides) was developed under transition metal-free and photocatalyst-free conditions.

Transition-metal-free catalytic hydroboration reduction of amides to amines

2020 ◽  
Vol 7 (21) ◽  
pp. 3515-3520
Author(s):  
Wubing Yao ◽  
Jiali Wang ◽  
Aiguo Zhong ◽  
Shiliang Wang ◽  
Yinlin Shao
Keyword(s):  
Transition Metal ◽  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Value Added ◽  
Metal Free

The selective catalytic reduction of amides to value-added amine products is a desirable but challenging transformation.

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